NMathFunctionsWeightedVariance(IDFColumn, IDFColumn) Method

Calculates the weighted variance of the given data.

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4

Syntax

public static double WeightedVariance(
	IDFColumn data,
	IDFColumn weights
)

Public Shared Function WeightedVariance ( 
	data As IDFColumn,
	weights As IDFColumn
) As Double

public:
static double WeightedVariance(
	IDFColumn^ data, 
	IDFColumn^ weights
)

static member WeightedVariance : 
        data : IDFColumn * 
        weights : IDFColumn -> float

Parameters

data IDFColumn: The data.
weights IDFColumn: The weights.

Return Value

Double
The weighted variance.

Exceptions

Exception	Condition
MismatchedSizeException	Thrown if data and weights do not have the same length.
NMathFormatConvertException	Thrown if data or weights are not numeric.

Remarks

If weights is an IDFIntColumn, the weights are interpreted as frequency counts, which in effect expand the data by these counts, so no normalization is performed. Otherwise, the weights are interpreted as sampling (reliability) weights and the weight values are normalized to sum to the length of the data column.

Reference

NMathFunctions Class

WeightedVariance Overload

CenterSpace.NMath.Core Namespace